Abstract
The microstructure, electrical conductivity, and electromagnetic interference (EMI) shielding effectiveness (SE) of Mg-xZn and Mg-xSn (x = 3,5) alloys prepared under different rolling and heat treatment conditions were systematically investigated to understand the effect of secondary-phase orientation on the electromagnetic-shielding property of magnesium alloys. Alloys were rolled to form basal textures and then subjected to different durations of solid-solution treatment and aging to induce the precipitation of secondary-phase particles along a specific direction. Experimental results indicated that in Mg-Zn and Mg-Sn alloys, secondary phases precipitated along directions perpendicular and parallel to the basal plane, respectively. When the direction of the incident electromagnetic wave is perpendicular to the basal plane, precipitates in Mg-Sn alloy parallel to the basal plane improve SE. The increment in SE is mainly attributed to the improvement in the reflection and multiple reflection losses of incident electromagnetic waves, which are caused by increasing the amounts of precipitates with specific orientations. Mg-5Sn alloy subjected to 16 h of solution treatment at 480 °C and 60 h of artificial aging at 170 °C for 60 h exhibited the maximum value of 107–89 dB and maximum increment in SE of 13 dB at 1200 MHz.
Highlights
Given the rapid development of electronic science and technology, electromagnetic radiation pollution has become the fifth most prevalent pollution after air, water, noise, and solid-waste pollution[1]
We previously found that in the frequency range of 30–1500 MHz, the shielding effectiveness (SE) of pure magnesium, AZ31, AZ61, ZK60, ZM61, and other commonly used magnesium alloys are significantly better than those of aluminum alloy with the same thickness but are lower than those of copper and copper alloys[14]
ZK60 magnesium alloy was treated through low-temperature aging, and its electromagnetic interference (EMI) shielding capacity was enhanced by inducing the precipitation of a secondary phase[15,16]
Summary
Given the rapid development of electronic science and technology, electromagnetic radiation pollution has become the fifth most prevalent pollution after air, water, noise, and solid-waste pollution[1]. Polymer materials and composites have inferior electromagnetic shielding effectiveness (SE) given their lower electrical conductivity than metallic materials[4]. Magnesium alloys, given their high conductivity, are a promising electromagnetic shielding material[10]. Compared with foam, coating, and composite materials, magnesium alloys have superior mechanical and electromagnetic shielding properties and can be used as engineering structural materials; compared with traditional metal materials, magnesium alloys have the advantages of low density, light weight, and high specific strength[11,12,13]. Magnesium alloys are potentially excellent EMI shielding materials, few reports exist on the influence of secondary phase on the EMI shielding properties of magnesium alloys[10]. The present study focuses on the effect of secondary-phase orientation on the electromagnetic shielding properties of magnesium alloys
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